Shimano GRX 400
To make the fastest possible gravel bike, you need to start with the tire. Tire choice determines comfort & grip. But it also determines how you can shape the frame to redirect the airflow.
To aerodynamically engineer the frame around the tires, you need to know what their REAL measurements are. Not what’s on the label, but how they really fit. That’s REALFAST aerodynamics. But it’s not easy, as the tire dimension depends on the rim you use, the pressure and of course how accurate the manufacturer’s claimed size is.
Freedom for all!!!!
Starting from our favorite tires, we then engineered a perfectly fitting rear wheel cutout (with mud clearance of course) and a closely trailing downtube to catch the airflow coming off the front tire. We added a super-narrow headtube (yet with a big steerer inside it), a multi-shape fork and aero details from seatstay to seatpost and from the shielded water bottle to the direct-attachment brake mounts.
Most importantly, we engineered this for realistic riding speeds, wind speeds, tire widths, bottle positions and even for mud. We don’t care if it is theoretically fast in the windtunnel with a fantasy spec. We care if it is fast the way you ride it in real world conditions.
SHIMANO GRX 600 2 x 11
|Rider Height* (cm)||145-160||157-171||168-180||176-186||183-195||192&Up|
|Rider Height* (inches)||4’9”-5’3”||5’2”-5’7”||5’6”-5’11”||5’9”-6’1”||6’0”-6’5”||6’3”&Up|
AERO with all of the tyre clearance
3T Racemax Ekar back in stock
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